Cmmg receiver extension kit w/mil-spec buffer tube ar-15 Features:-Combine this kit with your choice of lower parts kit & butt stockto complete your lower groupIncludes:-CMMG6-position receiver...
The MIL-SPEC 6 position AR buffer tube comes with a castle nut and is designed to fit MIL-SPEC collapsible buttstocks. Made of precision machined aircraft grade aluminum for durability and has a hard...